Examine source code of Elecmon

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Elecmon",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(51, 86, 255, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(180, 52, 45)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(38, 148, 232, 0.74)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(31, 73, 255)",
      "popup": "rgb(231, 242, 244)",
      "popup_text": "rgb(84, 84, 84)",
      "tab_loading": "rgb(31, 73, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7f546613-770e-4fdc-b8cd-279b473bffdb}"
    }
  }
}